<?php
$siteList= 'http://www.google.com - http://www.google.com';
$sites = explode(' - ', $siteList);
$mh = curl_multi_init();
$handles = array();

foreach($sites as $k => $v) {
    $ch{$k} = curl_init($url);
    curl_setopt($ch{$k}, CURLOPT_URL, $v);
    curl_setopt($ch{$k}, CURLOPT_HEADER, 0);
    $handles[$k] = $ch{$k};
}

foreach($handles as $k => $v) {
    curl_multi_add_handle($mh, $v);
}

$active = null;
do {
    $mrc = curl_multi_exec($mh, $active);
} while($mrc == CURLM_CALL_MULTI_PERFORM);

while($active && $mrc == CURLM_OK) {
    if(curl_multi_select($mh) != -1) {
        do {
            $mrc = curl_multi_exec($mh, $active);
        } while($mrc == CURLM_CALL_MULTI_PERFORM);
    }
}

var_dump($mh);

foreach($handles as $k => $v) {
    curl_multi_remove_handle($mh, $v);
}
curl_multi_close($mh);
?>